Mercurial > dropbear
annotate libtomcrypt/src/mac/pelican/pelican.c @ 1857:6022df862942
Use DSCP for IP QoS traffic classes
The previous TOS values are deprecated and not used by modern traffic
classifiers. This sets AF21 for "interactive" traffic (with a tty).
Non-tty traffic sets AF11 - that indicates high throughput but is not
lowest priority (which would be CS1 or LE).
This differs from the CS1 used by OpenSSH, it lets interactive git over SSH
have higher priority than background least effort traffic. Dropbear's settings
here should be suitable with the diffservs used by CAKE qdisc.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 25 Jan 2022 17:32:20 +0800 |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file pelican.c |
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13 Pelican MAC, initialize state, by Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_PELICAN |
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17 |
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18 #define __LTC_AES_TAB_C__ |
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19 #define ENCRYPT_ONLY |
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20 #define PELI_TAB |
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21 #include "../../ciphers/aes/aes_tab.c" |
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22 |
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23 /** |
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24 Initialize a Pelican state |
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25 @param pelmac The Pelican state to initialize |
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26 @param key The secret key |
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27 @param keylen The length of the secret key (octets) |
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28 @return CRYPT_OK if successful |
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29 */ |
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30 int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen) |
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31 { |
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32 int err; |
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33 |
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34 LTC_ARGCHK(pelmac != NULL); |
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35 LTC_ARGCHK(key != NULL); |
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36 |
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37 #ifdef LTC_FAST |
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38 if (16 % sizeof(LTC_FAST_TYPE)) { |
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39 return CRYPT_INVALID_ARG; |
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40 } |
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41 #endif |
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42 |
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43 if ((err = aes_setup(key, keylen, 0, &pelmac->K)) != CRYPT_OK) { |
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44 return err; |
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45 } |
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46 |
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47 zeromem(pelmac->state, 16); |
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48 aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K); |
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49 pelmac->buflen = 0; |
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50 |
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51 return CRYPT_OK; |
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52 } |
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53 |
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54 static void _four_rounds(pelican_state *pelmac) |
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55 { |
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56 ulong32 s0, s1, s2, s3, t0, t1, t2, t3; |
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57 int r; |
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58 |
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59 LOAD32H(s0, pelmac->state ); |
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60 LOAD32H(s1, pelmac->state + 4); |
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61 LOAD32H(s2, pelmac->state + 8); |
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62 LOAD32H(s3, pelmac->state + 12); |
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63 for (r = 0; r < 4; r++) { |
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64 t0 = |
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65 Te0(byte(s0, 3)) ^ |
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66 Te1(byte(s1, 2)) ^ |
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67 Te2(byte(s2, 1)) ^ |
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68 Te3(byte(s3, 0)); |
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69 t1 = |
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70 Te0(byte(s1, 3)) ^ |
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71 Te1(byte(s2, 2)) ^ |
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72 Te2(byte(s3, 1)) ^ |
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73 Te3(byte(s0, 0)); |
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74 t2 = |
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75 Te0(byte(s2, 3)) ^ |
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76 Te1(byte(s3, 2)) ^ |
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77 Te2(byte(s0, 1)) ^ |
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78 Te3(byte(s1, 0)); |
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79 t3 = |
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80 Te0(byte(s3, 3)) ^ |
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81 Te1(byte(s0, 2)) ^ |
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82 Te2(byte(s1, 1)) ^ |
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83 Te3(byte(s2, 0)); |
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84 s0 = t0; s1 = t1; s2 = t2; s3 = t3; |
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85 } |
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86 STORE32H(s0, pelmac->state ); |
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87 STORE32H(s1, pelmac->state + 4); |
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88 STORE32H(s2, pelmac->state + 8); |
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89 STORE32H(s3, pelmac->state + 12); |
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90 } |
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91 |
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92 /** |
285
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93 Process a block of text through Pelican |
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94 @param pelmac The Pelican MAC state |
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95 @param in The input |
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96 @param inlen The length input (octets) |
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97 @return CRYPT_OK on success |
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98 */ |
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99 int pelican_process(pelican_state *pelmac, const unsigned char *in, unsigned long inlen) |
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100 { |
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101 |
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102 LTC_ARGCHK(pelmac != NULL); |
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103 LTC_ARGCHK(in != NULL); |
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104 |
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105 /* check range */ |
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106 if (pelmac->buflen < 0 || pelmac->buflen > 15) { |
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107 return CRYPT_INVALID_ARG; |
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108 } |
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109 |
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110 #ifdef LTC_FAST |
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111 if (pelmac->buflen == 0) { |
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112 while (inlen & ~15) { |
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113 int x; |
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114 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) { |
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115 *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pelmac->state + x)) ^= *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)in + x)); |
285
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116 } |
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117 _four_rounds(pelmac); |
285
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118 in += 16; |
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119 inlen -= 16; |
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120 } |
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121 } |
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122 #endif |
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123 |
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124 while (inlen--) { |
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125 pelmac->state[pelmac->buflen++] ^= *in++; |
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126 if (pelmac->buflen == 16) { |
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127 _four_rounds(pelmac); |
285
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128 pelmac->buflen = 0; |
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129 } |
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130 } |
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131 return CRYPT_OK; |
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132 } |
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133 |
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134 /** |
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135 Terminate Pelican MAC |
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136 @param pelmac The Pelican MAC state |
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137 @param out [out] The TAG |
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138 @return CRYPT_OK on sucess |
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139 */ |
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140 int pelican_done(pelican_state *pelmac, unsigned char *out) |
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141 { |
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142 LTC_ARGCHK(pelmac != NULL); |
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143 LTC_ARGCHK(out != NULL); |
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144 |
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145 /* check range */ |
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146 if (pelmac->buflen < 0 || pelmac->buflen > 16) { |
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147 return CRYPT_INVALID_ARG; |
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148 } |
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149 |
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150 if (pelmac->buflen == 16) { |
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151 _four_rounds(pelmac); |
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152 pelmac->buflen = 0; |
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153 } |
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154 pelmac->state[pelmac->buflen++] ^= 0x80; |
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155 aes_ecb_encrypt(pelmac->state, out, &pelmac->K); |
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156 aes_done(&pelmac->K); |
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157 return CRYPT_OK; |
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158 } |
285
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159 |
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160 #endif |
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161 |
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162 /* ref: $Format:%D$ */ |
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163 /* git commit: $Format:%H$ */ |
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164 /* commit time: $Format:%ai$ */ |